osha ammonia standard
F.) which will permit the internal valve to close automatically in case of fire. Secure anchorage or adequate pier height shall be provided against container flotation wherever sufficiently high flood water might occur. Provides references that aid in beginning a PHA by recognizing process hazards. Ammonia Safety. Ammonia Awareness Program - ISNetworld RAVS Section - US. The refrigeration system shall be arranged with suitable controls to govern the compressor operation in accordance with the load as evidenced by the pressure in the container(s). Underground containers shall be set on a firm foundation (firm earth may be used) and surrounded with earth or sand well tamped in place. Each compressor shall have its individual driving unit. Farm vehicles shall conform with State regulations. This is based on a full shift, 8-hour time weighted average (TWA) exposure. There shall appear on each side and on the rear end of the container in letters at least 4 inches high, the words, "Caution - Ammonia" or the container shall be marked in accordance with DOT regulations. Although the loa… Note that this standard does not constitute a comprehensive detailed This paragraph applies to systems utilizing containers of 250 gallons capacity or less which are mounted on farm vehicles (implement of husbandry) and used for the application of ammonia to the soil. If desired, vent pipes from two or more safety-relief devices located on the same unit, or similar lines from two or more different units may be run into a common discharge header, provided the capacity of such header is at least equal to the sum of the capacities of the individual discharge lines. When transporting anhydrous ammonia, be sure to adhere to the following precautions and safety rules: Running Gear: Regularly inspect the wagon’s frame tongue, reach poles, anchor devices, wheel bearings, knuckles, ball joints, and pins for structural damage and wear and make necessary repairs and adjustments. All appurtenances shall be fabricated from materials proved suitable for anhydrous ammonia service. Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. Provisions for unloading tank cars shall conform to the applicable recommendations contained in the DOT regulations. All foundations shall extend below the frost line. Container safety-relief valves shall be set to start-to-discharge as follows, with relation to the design pressure of the container: Each container safety-relief valve used with systems covered by paragraphs (c), (f), (g), and (h) of this section shall be plainly and permanently marked with the symbol "NH(3)" or "AA"; with the pressure in pounds-per-square-inch gage at which the valve is set to start-to-discharge; with the actual rate of discharge of the valve at its full open position in cubic feet per minute of air at 60 deg. shall be connected between the compressor discharge and the discharge shutoff valve. The control mechanism for such valves may be provided with a secondary control remote from the delivery connections and such control mechanism shall be provided with a fusible section (melting point 208 deg. Containers with foundations attached (portable or semiportable tank containers with suitable steel "runners" or "skids" and commonly known in the industry as "skid tanks") shall be designed and constructed in accordance with paragraph (c)(1) of this section. They shall be equipped with shutoff valves having metallic handwheels, with excess-flow valves, and with extra heavy glass adequately protected with a metal housing applied by the gage manufacturer. 54 drill size as required in paragraphs (b)(6) (iv) and (v) of this section shall be equipped with excess-flow valves. The total refrigeration load shall be computed as the sum of the following: Load imposed by heat flow into the container caused by the temperature differential between design ambient temperature and storage temperature. "Labeled" means there is attached to it a label, symbol, or other identifying mark of a nationally recognized testing laboratory which, makes periodic inspections of the production of such equipment, and whose labeling indicates compliance with nationally recognized standards or tests to determine safe use in a specified manner. F. and 130 deg. Pump discharge shall also be equipped with a spring-loaded safety relief valve set at a pressure not more than 135 percent of the setting of the bypass valve or more than 400 p.s.i.g., whichever is larger. The provisions of subdivision (i) of this subparagraph shall not be construed as prohibiting the continued use or reinstallation of containers constructed and maintained in accordance with the 1949, 1950, 1952, 1956, 1959, and 1962 editions of the Code or any revisions thereof in effect at the time of fabrication. Safety-relief valves shall be so arranged that the possibility of tampering will be minimized. On all hose one-half inch outside diameter and larger, used for the transfer of anhydrous ammonia liquid or vapor, there shall be etched, cast,or impressed at 5-foot intervals the following information. Protective measures are needed to ensure the safety of those working with NH3 and any people who live, work, or otherwise are near NH3. Ammonia Pipe Marking Standards. The document shall be signed by a registered professional engineer or other person having special training or experience sufficient to permit him to form an opinion as to safety of the unit involved. Loading and unloading systems shall be protected by suitable devices to prevent emptying of the storage container or the container being loaded or unloaded in the event of severance of the hose. Markings shall be in increments of not more than 20 deg. Each container except those filled by weight shall be equipped with an approved liquid-level gaging device. Atmospheric storage shall be provided with vacuum breakers. The rate of discharge of spring-loaded safety relief valves installed on underground containers may be reduced to a minimum of 30 percent of the rate of discharge specified in Table H-36. Cold storage and food processing facilities often struggle with finding the best solution to meet the requirements of the OSHA Process Safety Management (PSM) Standard 29 CFR 1910.119, IIAR Bulletin 110, and the ANSI/IIAR Standard 6. 54 drill size. With the minimum temperature in degrees Fahrenheit for which the container was designed. Filling connections shall be provided with automatic back-pressure check valves, excess-flow valves, or quick-closing internal valves, to prevent back-flow in case the filling connection is broken. The compressor shall not be operated if either pressure gage is removed or is inoperative. All containers shall be equipped with a fixed liquid-level gage. Ammonia is considered a high health hazard because it is corrosive to the skin, eyes, and lungs. All connections shall be so designed and constructed that there will be no leakage when connected. At a concentration of only 50 parts per million (ppm), one sniff tells what is in the air. It can explode if released in an enclosed space with a source of ignition present, or if a vessel containing anhydrous ammonia is exposed to fire. Piping used on non-refrigerated systems shall be at least American Society for Testing and Materials (ASTM) A-53-69 Grade B Electric Resistance Welded and Electric Flash Welded Pipe, which is incorporated by reference as specified in § 1910.6, or equal. Each filling connection shall be provided with combination back-pressure check valve and excess-flow valve; one double or two single back-pressure check valves; or a positive shutoff valve in conjunction with either an internal back-pressure check valve or an internal excess flow valve. Every full trailer shall be equipped with self-energizing brakes. All liquid and vapor connections to containers except filling pipes, safety relief connections, and liquid-level gaging and pressure gage connections provided with orifices not larger than No. Size of discharge lines from safety valves shall not be smaller than the nominal size of the safety-relief valve outlet connection. OSHA’s former exposure limit for ammonia was 50 ppm as an 8-hour TWA. A spring-loaded, safety-relief valve capable of discharging to atmosphere the full flow of gas from the compressor at a pressure not exceeding 300 p.s.i.g. Such pipe shall be at least schedule 80 when joints are threaded. A suitable "hold down" device shall be provided which will anchor the container to the vehicle at one or more places on each side of the container. F. shall be supported in such a way, or heat shall be supplied, to prevent the effects of freezing and consequent frost heaving. The purpose and requirements stem from ANSI/ASME A13.1 to provide consistency with general pipe marking standards. This Ammonia Awareness Program (ISNetworld® RAVS®* Section), in addition to being a complete and functioning written safety program (chapter), it also contains all the required text elements that are sought by the ISNetworld RAVS® (Review And Verification Service) reviewer.This plan has been previously submitted and has achieved … Fixed tube liquid-level gages shall be designed and installed to indicate that level at which the container is filled to 85 percent of its water capacity in gallons. A hydrostatic relief valve shall be installed between each pair of valves in the liquid ammonia piping or hose where liquid may be trapped so as to relieve into the atmosphere at a safe location. F. except on containers provided with fixed level indicators, such as fixed length dip tubes, or containers that are filled with weight. Pumps shall be designed for at least 250 p.s.i.g. Safety relief devices used in systems covered by paragraphs (c), (f), (g), and (h) of this section shall be constructed to discharge at not less than the rates required in paragraph (b)(9)(i) of this section before the pressure is in excess of 120 percent (not including the 10 percent tolerance referred to in paragraph (b)(9)(ii) of this section) of the maximum permitted start-to-discharge pressure setting of the device. Shutoff valves shall not be installed between the safety-relief valves and the container; except, that a shutoff valve may be used where the arrangement of this valve is such as always to afford full required capacity flow through the relief valves. A suitable "stop" or "stops" shall be mounted on the vehicle or on the container in such a way that the container shall not be dislodged from its mounting due to the vehicle coming to a sudden stop. See EPA’s About PDF page to learn more. Gaging devices that require bleeding of the product to the atmosphere such as the rotary tube, fixed tube, and slip tube devices shall be designed so that the maximum opening of the bleed valve is not larger than No. 54 drill-size orifice shall have shutoff valves located as close to the container as practicable. If the relieving capacity required for fire exposure is greater than that required by (a) of this subdivision, the additional capacity may be provided by weak roof to shell seams in containers operating at essentially atmospheric pressure and having an inherently weak roof-to-shell seam. Facilities located within one of the 27 OSHA State Plans should contact their State Plan office for the specific requirements in their state, which may differ but must be at least as effective OSHA standards. In lieu of this requirement the same information may be contained on a nameplate permanently attached to the hose. Containers for product storage at less than 32 deg. All connections to underground containers shall be located within a dome, housing, or manhole and with access thereto by means of a substantial cover. Vent pipes, when used, shall not be restricted or of smaller diameter than the relief-valve outlet connection. The valve or valve installation shall provide weather protection. Excess flow valves where required by these standards shall close automatically at the rated flows of vapor or liquid as specified by the manufacturer. Containers which may contain liquid ammonia before being installed underground and before being completely covered with earth are to be considered aboveground containers when determining the rate of discharge requirements of the safety-relief valves. The minimum design pressure for containers shall be that specified in the regulations of the DOT. Storage areas shall be kept free of readily ignitable materials such as waste, weeds, and long dry grass. Paragraph (b) of this section applies to this paragraph unless otherwise noted. Example: "NH(3) 250-4050 Air" indicates that the valve is suitable for use on an anhydrous ammonia container, is set to start-to-discharge at a pressure of 250 p.s.i.g., and that its rate of discharge at full open position (subdivisions (ii) and (iii) of this subparagraph) is 4,050 cubic feet per minute of air. Occupational Safety & Health Administration, Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. NIOSHTIC-2 search results for ammonia – NIOSHTIC-2 is a searchable database of worker safety and health publications, documents, grant reports, and journal articles supported in whole or in part by NIOSH. A minimum of two compressors shall be provided either of which shall be of sufficient size to handle the loads listed in paragraphs (d)(8)(i)(a) and (b) of this section. Ammonia is a commonly used chemical in commercial and household cleaners. An emergency alarm and shutoff shall be located in the condenser system to respond to excess discharge pressure caused by failure of the cooling medium. Containers shall be gaged and charged only in the open atmosphere or in buildings or areas thereof provided for that purpose. Liquid-level gaging devices that require bleeding of the product to the atmosphere and which are so constructed that outward flow will not exceed that passed by a No. Compressors used for transferring or refrigerating ammonia shall be recommended for ammonia service by the manufacturer. A thermometer well shall be provided in all containers not utilizing a fixed liquid-level gaging device. "Farm vehicle" (implement of husbandry) - A vehicle for use on a farm on which is mounted a container of not over 1,200 gallons water capacity. shall be constructed in accordance with paragraph (b)(2) of this section, and the materials shall be selected from those listed in API Standard 620, Recommended Rules for Design and Construction of Large, Welded, Low-Pressure Storage Tanks, Fourth Edition, 1970, Tables 2.02, R2.2, R2.2(A), R2.2.1, or R2.3, which are incorporated by reference as specified in § 1910.6. Ammonia is considered a high health hazard because it is corrosive to the skin, eyes, and lungs. All vehicles shall carry a can containing 5 gallons or more of water. Ammonia Refrigeration’s (IIAR’s) Process Safety Management Guidelines for Ammonia Refrigeration and the IIAR’s Risk Management Program Guidelines for Ammonia Refrigeration address the additional requirements needed to meet United States regulations. Filling compressors may be used as standby equipment for holding compressors. When containers are mounted on four-wheel trailers, care shall be taken to insure that the weight is distributed evenly over both axles. No excess flow valve is required in the liquid withdrawal line provided the controlling orifice between the contents of the container and the outlet of the shutoff valve does not exceed seven-sixteenths inch in diameter. F. and atmospheric pressure (14.7 p.s.i.a.). Fittings shall comply with paragraph (b)(6) of this section. The flow capacity of the relief valve shall not be restricted by any connection to it on either the upstream or downstream side. Tubing made of brass, copper, or other material subject to attack by ammonia shall not be used. The Anhydrous Ammonia Standard (29 CFR 1910.111) addresses the storage and handling of anhydrous ammonia. Safety Standards for Ammonia Refrigeration (PDF) (2 pp, 157 K) Pipe shall be Schedule 80. With the wall thickness of the shell and heads. Each vehicle transporting ammonia in bulk except farm applicator vehicles shall carry a container of at least 5 gallons of water and shall be equipped with a full face mask. What OSHA standards and exposure guidelines apply to ammonia refrigerant? Provides links and references to additional resources related to ammonia refrigeration. Regulation equipment may be connected directly to the tank coupling or flange, in which case a flexible connection shall be used between such regulating equipment and the remainder of the liquid withdrawal system. With the maximum level to which the container may be filled with liquid anhydrous ammonia. ; Immediately Dangerous to LIfe or Health (IDLH) Value of ammonia– NIOSH reviews scientific data and researches methods for developing IDLH values. All excess flow valves shall be plainly and permanently marked with the name or trademark of the manufacturer, the catalog number, and the rated capacity. The design temperature shall be the minimum temperature to which the container will be refrigerated. However ammonia is a hazardous chemical, and, without proper safety procedures, ammonia leaks in the workplace can endanger workers and even the public. Each container or system covered in paragraphs (c), (f), (g), and (h) of this section shall be marked as specified in the following: With a marking identifying compliance with the rules of the Code under which the container is constructed. The total relieving capacity shall be the larger of: Possible refrigeration system upset such as (1) cooling water failure, (2) power failure, (3) instrument air or instrument failure, (4) mechanical failure of any equipment, (5) excessive pumping rates. The minimum design pressure for containers shall be 250 p.s.i.g. The OSHA Permissible Exposure Limit (PEL) for Anhydrous Ammonia is 50 parts per million (ppm) or 35 milligrams (mg)/cubic meter (m. 3). All connections to containers except safety relief devices, gaging devices, or those fitted with No. Brass, copper, or galvanized steel pipe shall not be used. If the pressure setting adjustment is external, the relief valves shall be provided with means for sealing the adjustment. For containers with total outside surface area greater than 2,500 square feet, the required flow rate can be calculated using the formula: Flow Rate CFM Air=22.11 A(0)(82), where A=outside surface area of the container in square feet". 60 drill-size opening to allow equalization of pressures. The shell or head thickness of any container shall not be less than three-sixteenths inch. Such pipe shall be at least schedule 40 when joints are welded, or welded and flanged. Hose used in ammonia service shall conform to the joint Agricultural Ammonia Institute - Rubber Manufacturers Association Specifications for Anhydrous Ammonia Hose. 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